theory of population growth

8/8/2019 Theory of Population Growth

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INTRODUCTION

TOSOCIOLOGY

Lecture 29


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THEORY OF

POPULATION

GROWTH


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Malthusian TheoryEssay on thePrinciple ofPopulation

by Thomas RobertMal

thus (1798).


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Basic Premise:

Food is necessaryforlife.

Procreation is

necess

ary for

life.


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The 2 necessities

grow at different rate

Popula

tion

atgeometrical ratio

(2,4,8,16,32,).Food at arithmetical

ratio (1,2,3,4,5, ).


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* Population out-grows food supply.

* Populationdoubles every 25

years.


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Measures to check highgrowth of population:

Preventive checks.

Positive checks.


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Preventive Checks:

Celibacy

Marry

late

Abstinence


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Positive Checks:Famine

Epidemics

WarNatural calamities


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Criticism:Too pessimistic view.

Food supplyrevolutionalized.

Use of contraceptivenot advocated.


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Theory of

Demographic

Transition:Linked birth rates

and death rates toindustrialization


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Stages indemographic transition

High B.R. and high D.R.

High B.R. and low D.R.

Declining B.R. and low D.R.

Low B.R. and low D.R.


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High to low mortality

and fertility:is demographic

transition


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Pa

ce of tran

sition

varies due to:

Cultural variation.

Eco. development.Other factors.


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Secon

ddemographic

transition where:

Fertility has fallenbelow

replacement level.


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Willall countries

follow the transitionas experienced by

Europe?


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Thank you

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